Machine-brake.



No. 653,637. Patented luly I0, |900.

D'. AS'HMAN.

MACHINE BRAKE.

(Application led Jn. 25, 1900.)

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'NITED STATES PATENT Ormes;

DAVID ASHMAN, OF BALTIMORE, MARYLAND,

MANUFACTURING CO.

ASSIGNOR TO EAGLE NIACHINEBRAKE.

srncIFrcArioN forming part of Letters Patent No. 653,637, dated July 1o,1900.

Application led January 25, 1900. Serial No. 2,736. (No model.)

To allai/hom t may concer-72,:

Be it known thatV I', DAVID AsHMAN, a citi- 'zen of the United States,residing at Baltimore, in the State of Maryland, have invented certainnew and useful Improvements in Machine-Brakes, of which the following isa specification.

This invention relates to improvements in a brake device for machines,and is especially adapted for use on sewing-machines employingily-wheels, although it is applicable to other classes of machines.

Thev invention is illustrated in the accompanying drawings, in which-Figure l is a vertical longitudinal section through the frame of amachine and illustrates the application of the invention. Fig. 2illustrates one view of the operating-lever. Fig. 3 is an inverted planview of the contact-brake device. Figli. is an elevation of part of themachine-frame and of the contact-brake device.

Referring to the drawings, the letters a c. designate two verticalstandards of the frame of the machine which support the top b and areconnected at the bottom by a stay-rod c, the ends of which pass throughthe standards and are secured thereto by means 0f nuts d.v The standarda is provided with a central hole e, through which one end of thedriving-shaft f is passed, and a fly or driving wheel g is mounted onthe projecting end of said shaft. A

guard his secured to the standard a by screws or bolts t', and saidguard takes over the said wheel g. The guard h is provided with a holeopposite the end of the shaft, and a conepointed screw 7c is secured insaid hole j, and the cone-point takes in a correspondinglyshapedindentation in the end of the shaft, thereby forming a cone-bearing. Theopposite end of the shaft is also supported in a similar cone-bearing,the cone-pointed pin k' being secured in the standard d.

The standards a, and of. are each provided with a hole or bearing m m',anda rod n is supported in said bearings and is movable carries abrake-arm 19', which extends parallel with said rod and the end of whichpasses through an oblong hole q in the frame or standard a'. A spiralspring r surrounds the rod aand is compressed between the sleeve p and 55 the standard c', and said spring serves to press against the sleeveand push it and the rod endwise away from the standard a. lt will beseen that the oblong hole q in the frame, which receives the end of thebrake-arm p', 6o is positioned so as to guide said arm in a horizontalplane to enable it to make contact with the rim of the fly or drivingwheel g', and at the same time this construction prevents said arm androd n from turning when the arm contacts with the revolving wheel. Theend of the arm p has a dovetailed recess, and a block of rubber or othermaterial s is inserted in said recess and contacts with the rim of theily-wheel when it is desired to stop the latter 7o from revolving.

The standard a at a point between the driving-shaft f andendwise-movable rod n is provided with a bracket t, which supports anoperating-lever u. The lever u at one end is provided with two prongs o,which take on opposite sides of the rod n between the two collars o o'.The said lever is provided with a pivot-hole w for a pivot-pin w', bymeans of which it is pivoted to the bracket t, and at the 8o lower endthe lever. terminates in a fiat plate which may be actuated by the kneeof the operator.

It will be seen that the collars 0 o and the sleeve p and arm p' are alladjustable on the 85 rod n.

The operation is as follows: Supposing the machine to be running and itbeing desired to stop the same, the operator will press against theplate @c of the lever u, pushing the 9o lower end of the lever towardthe standard a, whereupon the upper or prong end of the lever will movein the opposite direction or toward the standard ct. This movement ofthe prong end of the lever will push the rod n toward the standard a'and cause the brakearm p to project through the oblong hole q and pressthe rubbers against the rim of the driving-wheel g. The rod n andbrake-arm p', it has been stated, are prevented from roc turning withthe wheel g because of the walls of the oblong hole q.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is

In a brake device for machines, the combination of the standards a, a',formed with bearings m, m', and one of said standards ct being alsoformed with a hole q separate from its bearing; a shaft supported insaid standards; a drive or fly wheel carried thereon; a rod movableendwise through bearings in a direction parallel with said shaft; asleeve surrounding and secured to the movable rod and formed with abrake-arm p extending parallel with and spaced from said rod andprojecting through the said separate hole q in 15 and the adjacentstandard, and means for zo moving said rod and brake-arm.

In testimony whereof I aiiix my signature in the presence of twowitnesses.

DAVID ASHMAN.

Vitnesses:

CHARLES B. MANN, J r., CHARLES L. VIETscH'.

